On 26 September 2018, a five-judge Constitution Bench held that the creamy-layer principle applies to reservation in promotion for Scheduled Castes and Scheduled Tribes — and read down the requirement, articulated in M. Nagaraj (2006), that States collect quantifiable data to demonstrate backwardness of SC/STs as a condition for providing such reservation. The unanimous judgment of Justice Nariman recalibrates the doctrinal architecture between Indra Sawhney, M. Nagaraj, and the SC/ST promotion reservation regime. A digest of the question, the holding, the doctrinal logic, and the lineage.